Here's What Happens When You Put Camera Traps in Trees

The world holds very few unexplored places between zero and six feet off the ground. If humans can walk right up to it and take a picture, we probably already have. But the tops of the trees, like the bottom of the ocean, are a different story.

“We know so much less about arboreal mammal activity than we do about terrestrial mammal activity,” says Tremaine Gregory, a research scientist at the Smithsonian Conservation Biology Institute. She thought camera-trapping, a common method for obse

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